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Tianchang yongchang glass fiber products co., LTD

YONGCHANG GLASS FIBER 


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Discussion on the default classification of the diaphragm in the valve-regulated sealed lead-acid battery

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[Abstract]:
Adsorption glass fiber separator (AGM separator, hereinafter referred to as separator) is an important part of valve-regulated sealed lead-acid battery.
Adsorption glass fiber separator (AGM separator, hereinafter referred to as separator) is an important part of valve-regulated sealed lead-acid battery. Its performance and dosage directly affect the technical performance of the battery, especially the service life of the battery. The main role of the partition in the battery is:
(1) The separator acts as a carrier of sulfuric acid in the battery, and together with the plates, bears all the sulfuric acid required to adsorb the rated capacity of the battery in a lean state. This requires that the separator itself has sufficient ability to adsorb sulfuric acid. It also requires that the battery be designed with sufficient space for the separator and the proper amount of separator to be selected.
(2) In order to improve the sealing reaction efficiency of the valve-regulated sealed lead-acid battery, the separator should be able to provide sufficient oxygen passage when the battery is charged, so that the oxygen deposited by the positive electrode plate smoothly passes through the separator to the negative plate to synthesize water. Achieve oxygen circulation. This requires a reasonable microporous structure of the separator, and also requires the battery to be designed to determine the appropriate acid saturation of the separator.
(3) In the valve-regulated sealed lead-acid battery, the separator has the function of preventing the active material of the electrode plate from falling off and deforming the electrode plate, so that the service life of the battery is prolonged, which requires that the separator itself has a small shrinkage after injecting sulfuric acid. At the same time, the battery is also required to make the separator under a high pressure state.
(4) The resistance of the separator and the resistance formed at the contact with the plate are part of the internal resistance of the battery, which requires the separator to have a low resistivity and also requires the separator to be under a high pressure condition during battery design. Thus, the separator is in close contact with the plates, reducing the electrical resistance formed at the contacts.
In summary, the design of the diaphragm in the valve-regulated sealed lead-acid battery mainly includes the following two aspects:
a. Select the appropriate separator from the performance of the separator. The analysis of the role of the separator in the battery requires high acid absorption capacity, small shrinkage after acid absorption, reasonable microporous structure and electrical resistivity. Low characteristics. From the comprehensive performance requirements of the battery, the separator should also have the characteristics of low impurity content, high tensile strength and fast soaking speed;
b. Reasonable group structure design. It can be seen from the above analysis that it is required to make the separator have proper saturation when the battery is designed, and it is in a high pressure state, which requires the selection of a suitable separator.
In the following, we will give an approximate expression of the acid absorption capacity of the separator according to our practice and experimental measurement in the production of batteries, and also give a calculation method for the acid absorption of the separator in the valve-regulated sealed lead-acid battery. Do some discussion on the principle of determining the amount of separator. Please correct me if there are any deficiencies.
2 separator saturated acid absorption
The saturated acid absorption of the separator is an important basis for selecting the separator in the design of the valve-regulated sealed lead-acid battery. For a defined separator, the saturated acid absorption is related to the pressure applied to the separator.
The saturated acid absorption of the separator refers to the maximum acid absorption volume per unit weight of the separator under a certain pressure, expressed by Vb, and its unit is mL/g.
In a valve-regulated sealed lead-acid battery, when the working distance of the diaphragm is determined, the pressure applied to the diaphragm is determined by the number of spacers. If b is used, the sum of the positive and negative plates in the battery is A is used to indicate the total thickness of all the separators in the battery at a pressure of 10 kPa, and the value of a/b determines the pressure of the separator in the battery. Therefore, in a valve-regulated sealed lead-acid battery, the saturated acid absorption of the separator is determined by a/b.
Our production practice and special experiments have shown that when the value of a/b is in the range of 1.1 to 1.5 (corresponding pressure is 15 to 85 kPa), there is a linear relationship between the saturated acid absorption amount Vb of the separator and a/b. :
Vb=E(a/b)+F(1) where E and F are constants related to the properties of the separator itself. For the separators we use, E and F take 4.0 and 10.0, respectively.